Code Playground

:root {
	--_color: hsl(210 17% 98%);
	--_background: hsl(210 63% 12%);
	--_shadow: hsl(229 32% 10%);
	--_accent: hsl(360 83% 62%);
}

* {
	box-sizing: border-box;
	padding: 0;
	margin: 0;
}

body {
	font-family: system-ui;
	display: grid;
	place-items: center;
	min-block-size: 100svb;
	color: var(--_color, hsl(0 0% 99%));
	background: var(--_background, hsl(0 0% 15%));
	background-image: linear-gradient(135deg, var(--_shadow) 50%, transparent 50%),
		linear-gradient(-135deg, var(--_shadow) 50%, transparent 50%),
		linear-gradient(-45deg, var(--_shadow) 50%, transparent 50%),
		linear-gradient(45deg, var(--_shadow) 50%, transparent 50%);
	background-size: 2rem 2rem;
	background-repeat: repeat-x;
	background-position: 0% 0%, 0% 0%, 0% 100%, 0% 100%;
}

div {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 0.75rem;
}

button {
	font-family: inherit;
	font-size: 1rem;
	font-weight: 700;
	color: var(--_background, hsl(0 0% 15%));
	background: var(--_color, hsl(0 0% 99%));
	border: none;
	border-inline: 0.5rem solid var(--_accent, hsl(0 0% 60%));
	padding: 0.5rem 0.75rem;
	border-radius: 1e5px;
	transition: scale 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

button:hover {
	scale: 1.05;
	transition-timing-function: cubic-bezier(0.37, 0, 0.63, 1);
	transition-duration: 0.1s;
}

button:disabled {
	scale: 0.85;
}

button:focus {
	outline: 2px solid var(--_accent, hsl(0 0% 60%));
	outline-offset: 2px;
}

button:focus:not(:focus-visible) {
	outline: none;
}

const { Anchor, Shape, easeInOut } = Zdog;

const backInOut = (t) => {
	const s = 1.70158 * 1.525;
	if ((t *= 2) < 1) return 0.5 * (t * t * ((s + 1) * t - s));
	return 0.5 * ((t -= 2) * t * ((s + 1) * t + s) + 2);
};

const backOut = (t) => {
	const s = 1.70158;
	return --t * t * ((s + 1) * t + s) + 1;
};

(() => {
	const colors = {
		ball: ["hsl(360 83% 62%)", "hsl(210 17% 98%)"],
		star: "hsl(44 92% 63%)",
		seal: "hsl(210 17% 98%)",
		face: "hsl(209 20% 25%)"
	};

const strokes = {
		ball: 0,
		star: 1,
		fin: 3,
		eyebrow: 0.75,
		mouth: 0.75,
		whisker: 0.2
	};

const radii = {
		ball: 9,
		star: [2, 3.2],
		seal: 11,
		eye: 1.5
	};

const stripes = 8;

const PI = Math.PI;
	const TAU = PI * 2;
	const distance = radii.ball * 1.5;

const root = new Anchor();

const origin = new Anchor({
		addTo: root
	});

const ball = new Anchor({
		addTo: origin
	});

const slices = (() => {
		const r = radii.ball;

return Array(stripes)
			.fill()
			.map((_, i, { length }) => {
				const color = colors.ball[i % 2];

const a1 = (TAU / length) * i;
				const a2 = (TAU / length) * (i + 1);
				const am = (a1 + a2) / 2;
				const x1 = Math.cos(a1) * r;
				const y1 = Math.sin(a1) * r;
				const xm = Math.cos(am) * r;
				const ym = Math.sin(am) * r;
				const x2 = Math.cos(a2) * r;
				const y2 = Math.sin(a2) * r;

return {
					color,
					path: [
						{ x: 0, y: r * -1, z: 0 },
						{
							arc: [
								{ x: x1, y: r * -1, z: y1 },
								{ x: x1, y: 0, z: y1 }
							]
						},
						{
							arc: [
								{ x: xm, y: 0, z: ym },
								{ x: x2, y: 0, z: y2 }
							]
						},
						{
							arc: [
								{ x: x2, y: r * -1, z: y2 },
								{ x: 0, y: r * -1, z: 0 }
							]
						}
					]
				};
			});
	})();

for (const { color, path } of slices) {
		new Shape({
			addTo: ball,
			color,
			stroke: strokes.ball,
			fill: true,
			path
		});

new Shape({
			addTo: ball,
			color,
			stroke: strokes.ball,
			fill: true,
			path,
			scale: {
				y: -1
			}
		});
	}

const path = (() => {
		const [r1, r2] = radii.star;
		return Array(10)
			.fill()
			.map((_, i, { length }) => {
				const r = i % 2 === 0 ? r1 : r2;
				const angle = TAU / 4 + (TAU / length) * i;
				const x = Math.cos(angle) * r;
				const y = Math.sin(angle) * r;

return { x, y };
			});
	})();

const stars = new Anchor({
		addTo: origin
	});

const star = new Shape({
		color: colors.star,
		stroke: strokes.star,
		fill: true,
		path
	});

for (const { translate, rotate } of [
		{
			translate: { x: 0, y: radii.ball * -1, z: radii.ball },
			rotate: { z: 0 }
		},
		{
			translate: {
				x: radii.ball,
				y: (radii.ball / 2) * -1,
				z: radii.ball / 2
			},
			rotate: { z: 0.4 }
		},
		{
			translate: {
				x: -radii.ball,
				y: (radii.ball / 2) * -1,
				z: radii.ball / 2
			},
			rotate: { z: -0.4 }
		},
		{
			translate: { x: radii.ball * 1.5, y: 1, z: radii.ball },
			rotate: { z: 0.75 }
		},
		{
			translate: { x: -radii.ball * 1.5, y: 1, z: radii.ball },
			rotate: { z: -0.75 }
		}
	]) {
		star.copy({
			addTo: stars,
			translate,
			rotate
		});
	}

const seal = new Shape({
		addTo: origin,
		color: colors.seal,
		stroke: radii.seal * 2,
		fill: true
	});

for (const scale of [1, -1]) {
		new Shape({
			addTo: seal,
			color: colors.seal,
			stroke: strokes.fin,
			fill: true,
			path: [
				{ x: 0, y: 0 },
				{
					arc: [
						{ x: radii.seal, y: 0 },
						{ x: radii.seal, y: radii.seal }
					]
				},
				{ x: 0, y: radii.seal }
			],
			translate: {
				y: (strokes.fin / 2) * -1
			},
			scale: {
				x: scale
			}
		});

new Shape({
			addTo: seal,
			color: colors.seal,
			stroke: strokes.fin + 1,
			closed: false,
			fill: true,
			path: [
				{ x: 0, y: radii.seal, z: radii.seal * 2 * -1 },
				{
					arc: [
						{ x: 0, y: radii.seal, z: 0 },
						{ x: radii.seal, y: radii.seal, z: 0 }
					]
				}
			],
			translate: {
				y: (strokes.fin / 2) * -1
			},
			scale: {
				x: scale
			}
		});
	}

new Shape({
		addTo: seal,
		color: colors.seal,
		stroke: strokes.fin,
		fill: true,
		path: [
			{ x: 0, y: 0, z: 0 },
			{
				arc: [
					{ x: 0, y: 0, z: radii.seal * 2 * -1 },
					{ x: 0, y: radii.seal, z: radii.seal * 2 * -1 }
				]
			},
			{ x: 0, y: radii.seal, z: 0 }
		],
		translate: {
			y: (strokes.fin / 2) * -1
		}
	});

const neck = new Anchor({
		addTo: seal
	});

const face = new Anchor({
		addTo: neck,
		translate: {
			y: (radii.seal / 6) * -1,
			z: radii.seal / 1.4
		},
		rotate: {
			x: 0.1
		}
	});

for (const scale of [-1, 1]) {
		const eye = new Shape({
			addTo: face,
			color: colors.face,
			stroke: radii.eye * 2,
			translate: {
				x: (radii.seal / 3) * scale,
				y: (radii.seal / 4) * -1
			},
			scale: {
				x: scale
			}
		});

new Shape({
			addTo: eye,
			color: colors.face,
			stroke: strokes.eyebrow,
			closed: false,
			path: [
				{ x: -0.5, y: -0.25 },
				{
					arc: [
						{ x: 0.5, y: -0.25 },
						{ x: 0.5, y: 0.25 }
					]
				}
			],
			translate: {
				x: radii.eye / 1.5,
				y: radii.eye * 1.5 * -1
			}
		});
	}

const mouth = new Shape({
		addTo: face,
		color: colors.face,
		stroke: strokes.mouth,
		closed: false,
		path: [
			{ x: radii.seal / 4, y: 0 },
			{
				arc: [
					{ x: radii.seal / 4 + radii.seal / 8, y: 0 },
					{ x: radii.seal / 4 + radii.seal / 8, y: radii.seal / 8 }
				]
			},
			{
				arc: [
					{ x: radii.seal / 4 + radii.seal / 8, y: radii.seal / 4 },
					{ x: radii.seal / 4, y: radii.seal / 4 }
				]
			},
			{
				bezier: [
					{ x: 0, y: radii.seal / 5 },
					{ x: 0, y: radii.seal / 5 },
					{ x: (radii.seal / 4) * -1, y: radii.seal / 4 }
				]
			},
			{
				arc: [
					{ x: (radii.seal / 4 + radii.seal / 8) * -1, y: radii.seal / 4 },
					{ x: (radii.seal / 4 + radii.seal / 8) * -1, y: radii.seal / 8 }
				]
			},
			{
				arc: [
					{ x: (radii.seal / 4 + radii.seal / 8) * -1, y: 0 },
					{ x: (radii.seal / 4) * -1, y: 0 }
				]
			}
		],
		translate: {
			y: radii.seal / 12
		}
	});

const whisker = new Shape({
		color: colors.face,
		stroke: strokes.whisker,
		closed: false,
		path: [
			{ x: 0, y: 0 },
			{
				bezier: [
					{ x: radii.seal / 4, y: -0.5 },
					{ x: radii.seal / 4, y: -0.5 },
					{ x: radii.seal / 2, y: 0 }
				]
			}
		]
	});

for (const scale of [-1, 1]) {
		whisker.copy({
			addTo: mouth,
			translate: {
				x: (radii.seal / 5) * scale,
				y: radii.seal / 12
			},
			scale: {
				x: scale
			}
		});

whisker.copy({
			addTo: mouth,
			translate: {
				x: (radii.seal / 5) * scale,
				y: radii.seal / 12 + 0.5
			},
			rotate: {
				z: 0.2 * scale
			},
			scale: {
				x: scale
			}
		});
	}

const canvas = document.querySelector("canvas");
	const context = canvas.getContext("2d");
	const { width, height } = canvas;
	const zoom = 6;

context.lineCap = "round";
	context.lineJoin = "round";

const render = () => {
		context.clearRect(0, 0, width, height);
		context.save();
		context.translate(width / 2, height / 2);
		context.scale(zoom, zoom);
		root.renderGraphCanvas(context);
		context.restore();
	};

seal.translate.y = radii.seal + radii.ball;
	stars.translate.y = radii.ball;

root.rotate.x = -0.15;
	root.rotate.y = 0.5;
	root.translate.y = (radii.ball / 2) * -1;

let t = 0;
	stars.scale = t;
	stars.translate.z = t;
	for (const star of stars.children) {
		star.stroke = t;
	}

root.updateGraph();
	render();

let state = "wait";
	let frame = null;
	const cycles = [150, 30];
	let ticker = 0;
	let [cycle] = cycles;

const receive = () => {
		const t = ticker++ / cycle;
		const e = easeInOut(t);

stars.scale = backOut(t);
		for (const star of stars.children) {
			star.scale = 1 - e;
			star.stroke = e * strokes.star;
		}

root.updateGraph();
		render();

if (t >= 1) {
			stars.scale = 0;
			stars.translate.z = 0;
			for (const star of stars.children) {
				star.stroke = 0;
			}

root.updateGraph();
			render();

ticker = 0;
			cycle = cycles[0];
			state = "wait";
			cancelAnimationFrame(frame);
			button.removeAttribute("disabled");
		} else {
			frame = requestAnimationFrame(receive);
		}
	};

const lob = () => {
		const t = ticker++ / cycle;
		const l = Math.sin(t * PI);

ball.rotate.y = easeInOut(t, 2) * TAU;

ball.translate.y = backInOut(l) * distance * -1;
		origin.translate.y = Math.min(0, ball.translate.y * -1) * -1;

neck.rotate.x = backInOut(l) * 0.5;
		face.rotate.z = l * 0.2 * -1;

root.updateGraph();
		render();

if (t >= 1) {
			ticker = 0;
			cycle = cycles[1];
			frame = requestAnimationFrame(receive);
		} else {
			frame = requestAnimationFrame(lob);
		}
	};

const button = document.querySelector("button");
	button.removeAttribute("disabled");

const handleVolley = () => {
		if (state !== "wait") return;

state = "lob";
		button.setAttribute("disabled", true);
		frame = requestAnimationFrame(lob);
	};

button.addEventListener("click", handleVolley);
})();

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